PERMFILE68239

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 6/2/2006
• Section_Exhibit Name: Exhibit 71 Hydrologic Characterization South of The Divide Area
• Media Type: D
• Archive: Yes

Exhibit 11 Hydrologic Characterization Sou[h of the Divide Area and Monitoring Plan
EXHIBIT 71
HYDROLOGIC CHARACTERIZATION
SOUTH OF THE DIVIDE AREA
AND MONITORING PLAN
MOUNTAIN COAL COMPANY, LLC
WEST ELK MINE
TABLE OF CONTENTS
I.0 SUMMARY ........................................................................................................................................ ......1
2.0 SURFACE WATER HYDROLOGY .................................................................................................. ......2
2.1 Streams ............................................................................................................................ ......2
2.1.1 Dry Fork .............................................................................................................. ......2
2.1.1.1 Deer Creek ............................................................................................. ......4
2.1.1.2 Poison Gulch .......................................................................................... ....,.4
2.1.2 Lick Creek .......................................................................................................... ......4
2.1.3 Deep Creek ......................................................................................................... ......4
2.1.4 South Prong Creek .............................................................................................. ......5
2.2 Stock Ponds, Springs, and Seeps ..................................................................................... ......5
3.0 GROUND WATER HYDROLOGY .................................................................................................. ......8
3.1 Shallow Sediments ........................................................................................................... .... l l
3.2 Bedrock ............................................................................................................................ ....11
3.2.1 B-Seam ............................................................................................................... ....11
3.2.2 E-Seam ................................................................................................................ ....11
3.2.3 Strata Above the E-Seam .................................................................................... ....12
3.2.4 F-Seam ................................................................................................................ ....12
3.2.5 Barren Member above F-Seam ........................................................................... ....12
4.0 COMPREHENSIVE HYDROLOGIC MONITORING PLAN .......................................................... ....13
4.1 Summary .......................................................................................................................... ....13
4.2 Hydrologic Monitoring Plan ............................................................................................ ....13
4.3 Surface Water Monitoring ............................................................................................... ....15
4.3.1 Upper North Fork Drainage Basin Surface Water Monitoring Stations ............. ....18
4.3.1.1 Deep Creek ............................................................................................ ....18
4.3.1.2 Box Canyon ........................................................................................... ....18
4.3.1.3 Notch Fork Upper .................................................................................. ....18
4.3.1.4 Sylvester Gulch ...................................................................................... ....18
4.3.1:5 Raven Gulch .......................................................................................... ....19
4.3.2 Lower North Fork Drainage Basin Surface Water Monitoring Stations ............ ....19
4.3.2.1 North Fork Lower .................................................................................. ....19
4.3.2.2 Lotver Gribble Gulch ............................................................................. ....19
4.3.3 Minnesota Creek Drainage Basin Surface Water Monitoring Stations .............. ....19
4.3.3.1 Lick Creek Flume ................................................................................:. ....19
4.3.3.2 Dry' Fork ................................................................................................. ....19
4.3.3.3 Deer Creek ............................................................................................. ....20
4.3.3.4 Poison Gulch .......................................................................................... ....20
4.3.3.5 Horse Gulch and East Gulch, East of Horse Gulch ............................... ....20
4.3.3.6 Upper and Lower Minnesota Creek ....................................................... ....20
4.3.4 New Stream Monitoring Sites .............................................................................
4.3.4.1 Deep Creek Ditch .................................................................................. ....20
....20
April 2006 HydroGeo, lne